package com.atguigu.eduservice.service.impl;

import com.alibaba.excel.EasyExcel;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.entity.subject.OneSubject;
import com.atguigu.eduservice.entity.subject.TwoSubject;
import com.atguigu.eduservice.listenter.SubjectExcelListenter;
import com.atguigu.eduservice.mapper.EduSubjectMapper;
import com.atguigu.eduservice.service.EduSubjectService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程科目 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2021-01-28
 */
@Service
public class EduSubjectServiceImpl extends ServiceImpl<EduSubjectMapper, EduSubject> implements EduSubjectService {


    //添加课程分类
    @Override
    public void saveSubject(MultipartFile file,EduSubjectService subjectService) {

        try {
            //文件的输入流
            InputStream in=file.getInputStream();
            //调用方法进行读取
            //1.流
            //2.实体类
            //3.监听器
            EasyExcel.read(in, SubjectData.class,new SubjectExcelListenter(subjectService)).sheet().doRead();
        }catch (Exception e){
                e.printStackTrace();
        }

    }


    //课程分类列表（树形）
    @Override
    public List<OneSubject> getAllOneTwoSubject() {
        //1.查询所有的一级分类 parentid=0
        QueryWrapper<EduSubject> wrapperOne=new QueryWrapper<>();
        wrapperOne.eq("parent_id","0");
        //查出所有的一级分类
        List<EduSubject> oneSubjectList = baseMapper.selectList(wrapperOne);


        //2.查询所有的二级分类 parentid！=0
        //eq:=  ne:!=
        QueryWrapper<EduSubject> wrapperTwo=new QueryWrapper<>();
        wrapperOne.ne("parent_id","0");
        //查出所有的一级分类
        List<EduSubject> twoSubjectList = baseMapper.selectList(wrapperTwo);



        //创建list集合，用于存储最终封装的数据
        List<OneSubject> finalSubjectList=new ArrayList<>();

        //3.封装一级分类
        //查询出来所有的一级分类list集合遍历，得到每个一级分类的对象，获取每个一级分类对象值
        //封装到要求list集合里面List<OneSubject> finalSubjectList
        for (int i = 0; i < oneSubjectList.size(); i++) {//遍历oneSubjectList集合
            //得到oneSubjectList每个eduSubject对象
            EduSubject eduSubject = oneSubjectList.get(i);

            //把eduSubject里面的值获取出来，放到oneSubjectList对象里面
            //多个oneSubjectList放到finalSubjectList里面
            OneSubject oneSubject=new OneSubject();
//            oneSubject.setId(eduSubject.getId());
//            oneSubject.setTitle(eduSubject.getTitle());
            //简写方式
            //eduSubject值复制到对应oneSubject对象里面
            BeanUtils.copyProperties(eduSubject,oneSubject);
            finalSubjectList.add(oneSubject);

        //在一级分类循环遍历查询所有的二级分类
        //创建list集合封装每一个一级分类的二级分类
        List<TwoSubject> twoFianlSubjectList=new ArrayList<>();
            //遍历二级分类的集合
            for (int m = 0; m < twoSubjectList.size(); m++) {
                //获取每个二级分类
                EduSubject tSubject = twoSubjectList.get(m);
                //判断二级分类parentid和一级分类id是否一致
                if(tSubject.getParentId().equals(eduSubject.getId())){
                    //把tsubject值复制到twoSubject里面，放到twoFinalSubject里面
                    TwoSubject twoSubject=new TwoSubject();
                    BeanUtils.copyProperties(tSubject,twoSubject);
                    twoFianlSubjectList.add(twoSubject);
                }
            }
            //把一级下面所有的二级分类放到一级分类里面
            oneSubject.setChildren(twoFianlSubjectList);
        }
        //4.封装二级分类

        return finalSubjectList;
    }
}
